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Real Estate (Tenant Reimbursements) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Real Estate [Abstract]        
Tenant reimbursements $ 6.7 $ 7.0 $ 13.7 $ 15.6